Theme 4 Part 2 Circulation Flashcards
Can larger animals get by with just diffusion
No they need a circulatory system to transport stuff to and from them
If animals have higher metabolic rate they need
More rapid circulation
What is the cardiovascular system composed of
A muscular pump (cardio)
And vessels (vascular)
What are the two types of circulatory systems
Open or closed
What organisms have open circulatory systems
Arthropod and mollisks
What is an open circulatory system
Fluid in the insects body
Fluid is pumped into the system by the heart but isn’t closed into vessels
The fluid goes back to heart (pump)
No difference in hemolymph and extracellular fluid
What is a closed system
The fluids (blood) are enclosed in vessels now it’s called blood, pumped by heart
Generally moves unidirectionally (away from heart then back to heart)
Exchange between gasses between the blood and the interstitial fluid across the walls of the vessels throughout the body
What is in extracellular fluid?
Plasma
Erythrocytes
Leukocytes
Platelet
What is plasma
Water ions proteins nutrients and gases
What are the key ions in plasma
Na k cl HCO3 ca H
What are the key protiens in plasma
Globulins
Albumin
Fibrinogens
What are the key gasses in plasma
O2 CO2
What is in erythrocytes what do they do
Have respiratory pigments (hemoglobin)
Increase capacity of fluid to carry o2 and co2
What are leukocytes what do they do
White blood cells
Help in immune system
What does the heart do
Keeps the bulk flow of fluid in the presence of resistance
The resistance comes from friction in the vessels slowing the pumping of blood
